Inserted tooth for saws



(No Model.)

W. J. ROGERS 8v J. HOWE.

INSERTED TOOTH POE SAWS.

No. 458,120. Patented Aug. 18, 1891-.

m: new: PETER! co., marmn'mm, wuumuvou. n. c.

NITED STATES ATENT UFFICE.

\V'ILLIAM JAMES ROGERS AND JAMES HOlVE, OF LAUREL, CALIFORNIA.

INSERTED TOOTH FOR SAWS.

SPECIFICATION forming part of Letters Patent No. 458,120, dated August18, 1891.

Application filed February 17, 1890. $erial No. 340,815. (No model.)

To all whom it may concern:

Be itknown that we, \VILLIAM JAMES ROG ERS and JAMES HOWE, citizens ofthe United States, residing in the town of Laurel, in the county ofSanta Cruz and State of California, have invented an Improved InsertedTooth for Saws, of which the following is a specifi cation.

The objects of our invention are, first, to provide an inserted toothfor saws strong and simple in construction, cheap to make, and durablein wear; second, to so construct it that the cutting-bit can be swagedwithout removal from the saw, and, third, to provide a saw-tooth soarranged that the cutting-bit can be secured to the saw without thenecessity of removing the bit-holder. We accomplish these objects bymeans of the devices illustrated in the accompanying drawings, inwhich-- Figure 1 shows a portion of the periphery of a circular saw withour improved tooth in position. Fig. 2 shows the tooth unlocked andready to be removed from the holder. Fig. 3 shows an isometrical view ofthe cutting-bit. Fig. at shows an isometrical view of the fasteningdevice. Fig. 5 shows the bitholder removed.

Referring to the accompanying drawings, A is a cutting-bit; A, lug orprojection at the base of the bit; A throat-protector; a, V- groove onfront edge of bit; a, \'-groove on back edge of bit; B, bit-holder; C,securingrivet; D, bit-securing device, and d hole in D.

The construction and operation of our device are as follows:

The bit-holder B is made rectangular on three sides, and is secured inthe saw by being grooved around the three rectangular sides, the sawbeing shaped to receive it, the edges of the aperture into which theholder is placed being suitably beveled to fit the groove around theedges of the bit-holder, and a key-rivet C firmly locks the bit-holderin position. The bit is made with parallel edges, the cutting portionprojecting forward from the top end of the bit. Both front and rearedges of the bit are provided with V- grooves. A lug or teat projectsforward from the front edge at its lower extremity. The projectingportion which forms the cuttingpoint is ribbed or widened at its loweredge bit firmly in position.

for a suitable distance, commencing near the cutting-edge, to form awearing-strip or throat-protector.

To receive the bit, a parallel opening is made projecting inwardly fromthe outer edge in the bit-holder, corresponding in size .overlaps thebit, so that when the bit is in position the circular hole is complete.The edges of this circular hole are beveled on each side. The lockingdevice which secures the bit to the holder is a small circular platehaving a portion of its periphery removed. A groove is provided aroundthe circumference of this circular locking-plate, so that it will fitsnugly into the bevel-edged circular hole in the holder and bit. Theremoved portion of the circumference of the circular locking-platepermits of the insertion of the bit in the holder and its removaltherefrom, for it will readily be'seen that when this portion of thecircumference of the locking-plate is turned toward the bit the latteris free to be removed; but when the position of the circularlocking-plate is reversed it secures the The center portion of thislocking-plate may be removed, as shown in the drawings, so that it takessomewhat the form of a crescent, and by very slightly spreading thehorns of the crescent it becomes a stiff spring which will take up anywear which may be caused by frequent removals of the cutting-bits. Theportion of the locking-plate removed may be of such a shape as to form aconvenient means of turning the locking-plate by a key having the sameexterior shape.

To secure the bit in position, the circular locking-plate being inposition, the removed portion of its periphery being turned toward thebit-recess, the bit can now be readily slid into its position, and byturning the lockingplate it is there secured. To remove it, thisoperation is simply reversed. hen it is desirable to swage or Widen thecutting-edge of the bit, it is not necessary to remove it from theholder, owing to the large surface of the back of the bit which is incontact with the bit-holder.

Having now described our invention,what we claim as new, and desire tosecure by Letters Patent, is

1. The combination of a saw-plate, an inserted tooth suitably fittedinto it, and a securing or locking device consisting of a circular platehaving a portion of its periphery removed, the removed part extendinginto the circular plate, thereby forming the locking-plate approximatelyinto the shape of a crescent, the horns of the crescent-shaped lockingdevice being very slightly spread from a true circle to form a springand 10- cated in such a position that a portion of it extends into theinserted tooth, substantially as described.

2. The combination of a saw-plate, a parallel-sided bit-holder suitablysecured therein, an insert-ed tooth suitably fitted in the bitbolder,and a crescent-shaped securing or locking device, the horns of which arespread to form a spring, inserted into a circular hole so located in thebit-holder that a portion of its circumference overlaps one of the sidesof the bit, and any suitable means for holding the locking device inposition, substantially as described.

WVILLIAM JAMES ROGERS. JAMES HOWVE.

\Vitnesses:

GEO. W. NEFFINGER, JOHN WILLIAMS.

